[PATCH v6 3/6] net: pch_gbe: Support DeviceTree for MDIO/PHY description

[Paul Burton <paul.burton@mips.com>]

When running on a system which uses device tree, use
of_mdiobus_register() rather than plain mdiobus_register() in order to
support parsing PHY information from the DT.

On systems without CONFIG_OF_MDIO set of_mdiobus_register() falls back
to mdiobus_register() anyway, but here we check for a non-NULL device
node in order to continue functioning as-is if a system has
CONFIG_OF_MDIO=y but doesn't use the devicetree.

Signed-off-by: Paul Burton <paul.burton@mips.com>
Cc: Andrew Lunn <andrew@lunn.ch>
Cc: David S. Miller <davem@davemloft.net>
Cc: linux-mips@linux-mips.org
Cc: netdev@vger.kernel.org

---

Changes in v6:
- New patch, significantly simplified by Andrew's preceding patches.

Changes in v5: None
Changes in v4: None
Changes in v3: None
Changes in v2: None

 drivers/net/ethernet/oki-semi/pch_gbe/pch_gbe_main.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/net/ethernet/oki-semi/pch_gbe/pch_gbe_main.c b/drivers/net/ethernet/oki-semi/pch_gbe/pch_gbe_main.c
index b20ed110cdef..f491044c2739 100644
--- a/drivers/net/ethernet/oki-semi/pch_gbe/pch_gbe_main.c
+++ b/drivers/net/ethernet/oki-semi/pch_gbe/pch_gbe_main.c
@@ -25,6 +25,7 @@
 #include <linux/gpio.h>
 #include <linux/gpio/consumer.h>
 #include <linux/at803x_phy.h>
+#include <linux/of_mdio.h>
 
 #define DRV_VERSION     "1.01"
 const char pch_driver_version[] = DRV_VERSION;
@@ -829,6 +830,9 @@ static int pch_gbe_init_mdio(struct pch_gbe_adapter *adapter)
 
 	adapter->mdiobus = bus;
 
+	if (dev->of_node)
+		return of_mdiobus_register(bus, dev->of_node);
+
 	return mdiobus_register(bus);
 }
 
-- 
2.17.0